Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef87ba1ade5b0d6…

MALICIOUS

PDF

43.2 KB Created: 2020-08-02 12:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83b7d58652a38d6517d072c0b38f3f95 SHA-1: 3d08785813c87ad4d3ae4c234e78afbc74baac84 SHA-256: 4ef87ba1ade5b0d697c9b95fa308acda60e4949bb6ca401ef856af21e0bb29a3
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a download button, which is a common lure for phishing or malware distribution. The link leads to a URL that further redirects to a PDF file. The document body contains obfuscated text and a reference to the malicious URL, reinforcing the malicious intent.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=an+introduction+to+biostatistics+thomas+glover+pdf
    • http://files.abookstudio.com/uploads/1/3/0/7/130740255/fugeduvevepo_dozutazi_wuxiki_rerozesifeja.pdf
    • http://files.rmlandscape2.com/uploads/1/3/0/7/130740551/riwib.pdf
    • http://files.debrisofwar.com/uploads/1/3/2/7/132710783/xidumoxif-terozibakidu.pdf
    • http://files.alstrangeways.com/uploads/1/3/0/9/130969608/7543779.pdf
    • http://files.denvermindfulmedicine.com/uploads/1/3/0/8/130813095/0be2d3.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/concord_4_program_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/lepitifesukiserativini.pdf
    • https://cdn.shopify.com/s/files/1/0438/4676/2656/files/41261550024.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/39861092218.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/jada_fire_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/vidatigivulumebudot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7310/files/14414117649.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/78001089878.pdf
    • https://cdn.shopify.com/s/files/1/0432/6290/2438/files/xaxitedoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000687b.bin
6a7f5ef929b65b7bab93fd5424d2a6a5b59e20f0f065e7dc2ce5116c8073ba38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687B 5756 bytes
font_01_sfnt_off00007bf0.bin
acdf5d5a16526bef9fcae8a486bf744ddd474a7fb9ddc4932cbcc605c5d36127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 10400 bytes

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